As notable as this week's cold wave was — bringing the coldest air seen since 1996 or 1994 over much of the nation — the event failed to set any monthly or all - time
record low minimum temperature records at airports and cooperative observing stations monitored by NOAA's National Climatic Data Center.
* Image source: Meehl, G. A., C. Tebaldi, G. Walton, D. Easterling, and L. McDaniel (2009), Relative increase of record high maximum temperatures compared to
record low minimum temperatures in the U.S., Geophys.
Warming denialism has had little new to offer for some time; more effort seems to have been focussed on the supposed «recovery» of Arctic sea ice in 2013 and 2014, following the stunning new
record low minimum of 2012.
Figure 1: Map of Arctic sea ice cover during
its record low minimum in September 2012.
For Antarctica, the lowest maximum extent, recorded on September 12, follows
a record low minimum sea ice coverage recorded on March 1 after the summer thaw, he said.
Even in a much warmer climate, we're setting
record low minimum temperatures on a few days each year.
New University of Colorado at Boulder calculations indicate
the record low minimum extent of sea ice across the Arctic last September has a three - in - five chance of being shattered again in 2008 because of continued warming temperatures and a preponderance of younger, thinner ice.
Now it's official: as of September 16, according to the National Snow and Ice Data Center, the sea ice covering the Arctic Ocean reached
a record low minimum extent.
Even in a much warmer climate, we're still setting
record low minimum temperatures on a few days of the year.
Her first post explored this question: «How should we interpret
the record low minimum sea ice extent?»
But while this winter's ice pack is troublingly low, there's still no guarantee there will be
a record low minimum, which usually arrives in September.
And in 2016 the number of daily record high minimum temperatures outnumbered
record low minimum temperatures 7 - to - 1.
During June, July and August, record high minimum temperatures outnumbered
record low minimum temperatures by about three to one.
There were only 1,235
record low minimum temperatures set per month, while there were 1,697 record low maximum temperatures set per month.
Standard methods of identifying record - setting trends are complex and not robust
Record low minimums decreasing, record high maximums increasing Novel, simple method presented here will be useful for climate impact studies
Not exact matches
The last seven years witnessed the seven
lowest minimum extents since satellite observations began in 1979, and there was last a
record high with Arctic ice cover two decades ago, according to federal data.
After a decade with nine of the
lowest arctic sea - ice
minima on
record, including the historically
low minimum in 2012, we synthesize recent developments in the study of ecological responses to sea - ice decline.
The animation of satellite data shows the physical extent of the ice cover for each of those
minimum dates, ending with the
record low.
Since that year the
minimum ice cover has declined rapidly, dwindling to an all - time
record low of 3.4 million square kilometers on September 16, 2012.
AWI researchers observed a considerable decrease in the thickness of the sea ice as early as the late summer of 2015, even though the overall ice covered area of the September
minimum ultimately exceeded the
record low of 2012 by approximately one million square kilometres.
In the last three years, the sea ice's extent - the ocean area in which a defined
minimum of sea ice can be found — was at its
lowest in the 30 - year satellite
record.
The 10
lowest minimum extents in the satellite
record have occurred in the last 11 years.
In Antarctica, this year's
record low annual sea ice
minimum of 815,000 square miles (2.11 million square kilometers) was 71,000 square miles (184,000 square kilometers) below the previous
lowest minimum extent in the satellite
record, which occurred in 1997.
«Arctic sea ice summertime
minimum is fourth
lowest on
record.»
The 2014
minimum was 1.94 million square miles (5.03 million square kilometers), the seventh
lowest on
record.
According to a NASA analysis of satellite data, the 2015 Arctic sea ice
minimum extent is the fourth
lowest on
record since observations from space began.
This year's
record low sea ice maximum extent might not necessarily lead to a new
record low summertime
minimum extent, since weather has a great impact on the melt season's outcome, Meier said.
The sea ice fringing Antarctica also set a
record low for its annual summer
minimum (with the seasons opposite in the Southern Hemisphere), though this was in sharp contrast to the
record highs racked up in recent years.
The
record -
low winter maximum doesn't necessarily herald a
record low end - of - summer
minimum come September, as summer weather patterns have a large effect on sea ice area.
At the moment, this year's annual summer
minimum Arctic - wide ice coverage is the fourth
lowest on
record, with similar
low coverage in the NWP, according to information provided by the Canadian Ice Service.
A late - season surge in melt still pushed the summer
minimum to the second
lowest on
record.
The Antarctic summer
minimum was 813,000 square miles, or 900,000 square miles below the 1981 - 2010 average and 71,000 square miles below the previous
record low set in 1997.
At its
minimum on September 16, the ice covered an area about the size of India; that is 18 percent smaller than the previous
record low, set in 2007.
Ruiz, who contributed to the report, noted that an analysis of weather
records at one páramo research station showed increases in
minimum temperatures were almost twice that of
lower elevations, while increases in maximum temperatures jumped to nearly three times the average at
lower elevations.
The area of the Arctic Ocean covered by sea ice in September, when the annual
minimum occurs, was the sixth
lowest extent in the satellite
record, going back to 1979.
Since 2000, in the average month,
record highs (high maximum temperature) beat out
record lows (
low minimum temperature) by a two to one margin.
In the Antarctic, where the summer season just wrapped up, rapid ice melt led to the
lowest sea ice
minimum ever
recorded for the area.
Even though the annual
minimum usually happens in mid-September, ice had already reached its 5th -
lowest annual volume on
record at the end August.
This is the second
lowest minimum extent in the satellite
record,
This is the second
lowest minimum extent in the satellite
record, 70,000 sq km larger than the
record set in 2017.
The
record low maximum doesn't necessarily guarantee a
record -
low summer sea ice
minimum, though, as ice melt depends heavily on Arctic weather patterns through the spring and summer months.
Twenty - sixteen also brought forth
record -
low average Arctic sea ice for much of the year, and the second
lowest minimum sea ice cover reported.
Despite efforts to clean up the stratosphere of ozone - depleting chemicals, this year's ozone hole
minimum bottomed out at the fourth
lowest on
record.
For example the Central England Temperature
record tells us that annual average temperatures in the 1690s (in the depths of the Maunder
Minimum) plummeted as
low as 7.27 deg C (in 1695) but rose to 10.47 deg C (in 1733 - note that the figure for 2005 is 10.44 deg C).
Current ice extent is well below levels at the same point in 2012, which went on to set the current
record for the
lowest sea ice
minimum extent:
If you are eating a
low number of calories, you might want to weigh and
record everything you eat and then calculate whether you are meeting the
minimum protein intake requirements (I believe 45 - 50g / day).
The current FHA - mortgage rates broke
records for
low interest again last year, but will the
minimum credit scores and increased equity requirements prevent the qualifications for too many struggling borrowers?
Consumers» fears of missing payments hit
record low, NY Fed says — Consumers» expectations of meeting their
minimum debt payments reached a
record level of optimism in March, New York Fed survey finds.
Or, we could have a repeat of last year's coolish and cloudy summer, which could save the fall
minimum from reaching a new
record low.
My bet is that this year's Arctic Sea ice extent ice will not fall below last year's
minimum (4.28 or 2.77), because last year's
minimum was very
low in comparison to all other years of
record (1979 - current).